南京市北郊夏季挥发性有机物的源解析  

Source Apportionment of VOCs in the Northern Suburb of Nanjing in Summer

作　　者：杨辉[1] 朱彬[1] 高晋徽[1] 李用宇[1] 夏丽[1] 

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室,南京210044

出　　处：《环境科学》2013年第12期4519-4528,共10页Environmental Science

基　　金：国家自然科学基金项目(41275143);江苏省高校自然科学研究重大基础研究项目(12KJA170003);江苏省"333"高层次人才培养工程项目;江苏省"六大人才高峰"计划项目;江苏省江苏高校优势学科建设工程项目(PAPD);江苏省普通高校研究生科研创新计划项目(CXLX13_493)

摘　　要：2012年8月利用在线气相色谱仪对南京市北郊大气环境中的挥发性有机物(VOCs)进行连续监测,分析VOCs时间变化规律,并利用PMF(positive matrix factorization)受体模型和CPF(conditional probability function)方法对其来源进行解析.结果表明,南京市北郊夏季VOCs日变化呈双峰分布,小时平均体积分数为(33.84±27.77)×10-9,夜间高于昼间.其中含量最高的是烷烃,其次是烯烃和芳烃,分别占到总挥发性有机物(TVOCs)的49.3%、24.4%和18.5%,乙炔占7.8%.南京市北郊夏季VOCs主要来源有5个,分别是交通尾气、燃料挥发、工业排放、有机溶剂挥发和植物排放源,各自对TVOCs贡献为33.1%、25.8%、23.2%、8.1%和9.7%.烷烃主要来源于汽车尾气排放、工业排放和燃料挥发,贡献百分比分别为23.7%、35.3%和31.3%;烯烃主要来源于燃料挥发、工业排放和汽车尾气排放,分别占41.1%、18.4%和24.3%;对芳烃贡献最大的为汽车尾气排放,占到49.2%,其次是有机溶剂挥发排放占30.8%.Hourly concentrations of ambient volatile organic compounds （VOCs） were sampled in August 2012 in the northern suburb of Nanjing. Emissions of VOCs were analyzed by using PMF （ positive matrix factorization） and CPF （ conditional probability function）. The hourly average mixing ratio of the TVOCs in summer was （33.84±27.77）×10^-9, with a bimodal diurnal variation trend. 49.3% of the TVOCs were alkanes, 24.4% were alkenes, 18.5% were aromatics and 7.81% were acetylene. Five sources were identified as summer major contributors to ambient VOCs concentrations by PMF. 33.1% of the total VOCs was attributed to vehicle related emissions, 25.8% to fuel evaporation, 23.2% to industrial emissions, 8.1% to solvent evaporation and 9. 7% to plant emissions. For alkanes, vehicle emissions, industrial emissions, fuel and solvent evaporation accounted for 23.7% , 35.3% , 31.3% and 2% , respectively. For alkenes, fuel evaporation accounted for 41.1% , industrial emissions for 18.4% , and vehicle emission for 24. 3%. Vehicle emission was the major contributor to aromatics, accounting for 49.2%, followed by solvent evaporation, which accounted for 30. 8%.

关 键 词：挥发性有机物 变化特征 PMF受体模型 条件概率函数 源解析 

分 类 号：X511[环境科学与工程—环境工程]